Up here in Alaska its not unusual to experience loss of commercial
power (often due to Inclement wx or avalanche). I've noted how quiet
my radio is when no one around us has power. Even running our 6500w
Honda invertor-generator its very quiet (which also tells my noise is
coming from neighbors and not my appliances).
Also, I have found the IBM Think pad (laptop) is very quiet (even
with charger). I think this largely because the case is metallic and
not plastic.
This story does remind us to periodically check our house for noise
sources - might be pleasantly surprised.
I have been plagued by S9 level interfering noise on 144-MHz for 3-4
years. Recently I checked coax loss on some lines when I had to roll
up all for some house work. I found excessive loss in my two
130-foot LMR-400 Rx lines (runs from preamps on tower to transverter
in house). Since replacing the lines I think I have lessened the
interference, making suspect some may have been due to passive
intermod in those lines. Loss was probably moisture caused corrosion
which might interact with out of band signals. Passive IM is tested
by the cellular industry at their tower sites.
I still see occasional noise interference but its less often and less
problem-some.
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[email protected]
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